A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 5990-01-386-5561
NSN 5950-00-800-9949
NSN 6145-00-821-9040
NSN 5915-01-302-2744
NSN 6145-01-573-6601
NSN 5930-01-589-1309
NSN 5960-00-491-4319
NSN 5920-01-367-9281
NSN 4140-01-109-1459
NSN 6610-00-527-8892
NSN 6620-01-578-1984
NSN 5985-00-578-7740